(Science: geology) An old term rather loosely used to designate various dark-coloured, heavy igneous rocks, including especially the feldspathic-augitic rocks, basalt, dolerite, amygdaloid, etc, but including also some kinds of diorite. Called also trap rock. Trap tufa, Trap tuff, a kind of fragmental rock made up of fragments and earthy materials from trap rocks.
Origin: Sw. Trapp; akin to trappa stairs, Dan. Trappe, G. Treppe, D. Trap; so called because the rocks of this class often occur in large, tabular masses, rising above one another, like steps. See Tramp.
2. A snare; an ambush; a stratagem; any device by which one may be caught unawares. Let their table be made a snare and a trap. (Rom. Xi. 9) God and your majesty Protect mine innocence, or I fall into The trap is laid for me! (Shak)
3. A wooden instrument shaped somewhat like a shoe, used in the game of trapball. It consists of a pivoted arm on one end of which is placed the ball to be thrown into the air by striking the other end. Also, a machine for throwing into the air glass balls, clay pigeons, etc, to be shot at.
4. The game of trapball.
Origin: OE. Trappe, AS. Treppe; akin to OD.trappe, OHG. Trapo; probably fr. The root of E. Tramp, as that which is trod upon: cf. F. Trappe, which is trod upon: cf. F. Trappe, which perhaps influenced the English word.